MT62
You aren’t on your own Dickens, it’s a horrible word.
I could never imagine my mum using that about us girls.
I think she was trying to appear cool at her daughter’s expense. Or they might have that kind of open family, where they can talk like that.
The upper classes can come across like that.
Back in the mid 60s, I was in a typical east-end pub somewhere near Canning Town It had an upstairs room which was being used as a venue for a Union meeting - WLTB (Watermen, Lightermen, Tugmen and Bargemen's Union). My then boyfriend was a Lighterman.
Downstairs was rather 'spit-and-sawdust' and not really the kind of establishment most women would choose to go to, but along with a handful of other women, I was waiting for the meeting to end nursing a glass of something or other, nervously, because at the bar was a group of boisterous 'lads' who were quite obviously talking or joking about s-e-x 
... and getting louder by the minute. One of the group ended his tale or joke with the word sh***g - loudly, which drew much merriment.
A burly middle-aged docker nearby slid off his stool and yelled across to them, "Oi, there's women present 'ere, tone it down mate"... it's one of those moments that stays in your mind!
Of course, no one would bat an eyelid now in fact, it's just as likely that a woman would be using the word.
And, yes, you're right, the so-called upper-class do sometimes pepper their conversation with vulgar slang as if they think it's 'cool'. Boris Johnson used one such word in 2019 which caused a backlash; "£60m I saw was being spaffed up the wall on some investigation into historic child abuse and all this kind of thing". Another word that makes me cringe.
Rather difficult to accept their mea-culpas about Epstein / and or child sex abuse when they use such dismissive terminology...
